Hygrometer for regulating humidifying and heating systems.



J SHEETS-SHEET 1.

incustodi- I j n {yy-679 y n dl'lozncq- Patented Aug. 23, 19107."y

PP'LIOATIOB FILED DBU. 14, 1909.*-

S. W. CRAMERdn W. B.y HODGE.'

a M. E k T. S, Y s* G N I T A E E D N A G N I Y nr. I D I M U E GV N I T A L U nu. E Dn U.. .un E T E M Q m G .no n 1 l`Unigrnne'rnrne A"Pyrnn'r OFFICE.

y STUART W. CRAMEP. AND WILLJAM B. HoDGE. or cHARLoTTE, NORTH CAROLINA; l

SAID HODGE lASSIGNOR TO SAID CRAMER.

HYGRQMETER PC RYREGULATING HU1ll.`H)I}:"YI1\lGr` AND HEATING SYSTEMS.

Specification of Letters Patent.

Application filed December :t4` 1909. Serial No. 533,036.

` To all whomit 'may concern:

Be itknown that we, Sriurr lV. Canti-:n and 'Innmu l. llonun,` citizensbf the United States. residing,r at Charlotte.. in the county ot' Mecklenburg and State ot' Nori! y; Carolina. have invented certainr new and useful improvements in llygrometers tor' Regulating Humidifying and Heating Systems; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilledl in* the art' to which it appertains to make and use the same.

This invention relates to hygrometers for regulating humidifying,lr and heating systems and consists in certain'improvements by means of which-.the member indicating the `temperature of evaporation is maintained under more-uniform conditions and more in accordance with the true tempera kture of evaporation than in the older types. y Hygrometers with wet lmlbfmembeis cov-v ered with absorbent material are well known in the art. They are subject` to more or les uuu-curaey owing to the fact. that the fibers of the material covering thi-'wet bulb be come` coated with dust and dirt, and the kplaced, and in locations where any appreciable dust and dirt areyresent, it frequentlyy becomes necessary to change the covering as `often as once a day, otherwise the instrument indicates in an erratic and grossly inaccurate manner. .A

'The invention will be fully1 disclosed in the following speeilication and claims.

'In the acconuiairving: drawings. which forni part of this. specification: -lt`igurc l represents a i'ront elevation of our improved instrument. Fig. 2 a vertical transverse section on line 2---2 Fig. l. the tem ot' the wet bulb nicmbcr being ruvitted'.,aml Fig, ZS a rear elevation.

Reference being had to the drawings and the designating charactere thereon. l indicates a suitable lmckboard on which is mounted a dry bulb thermometer 2. and a wet. bulb thermometer 8. 'lhese thermome- :er can be ot' ary convenient type. the moana` ers 10 and 11.

:'for cooling the wet bulb being particularly applicable to large and bulky typen. l a partition separating thermometer-t Al and 3, so that the cooled air surrounding wetfbulb thermometerl 3 will not. affect the.

indicationsl of the dry bulb thermometer :2.

T he thermometers are secured to the back lby means of clips 5. and for protecting Patented Aug. 23, 1910.

pu.-`oses, a shield 6 'surrounds the bulb of thermometer 2. The bulb of thermometer is exposed tothe temperature of' the air in the room where it may be placed, and consequently indicates dry bulb temperature. The bulb -t' of thermometer Il in the construction shown is turned at a right angle to the stem 4". Attached to the liachboard l is a frame 7 which carries cylimlers or rollein 8 and' 9 as well as idler cylinders or roll- ()n cylinder 9 is wound a strip of cloth or textile fabric 9 suitable for a wet bulb cover-ino'. This cloth moisture conveyor' extends down under one of the rollers 10; thence up past one idler 11 around and over-the bulb -i of the ther- Amometer 3. then down the other side past f cloth or other absorbent material can be unwound from cylinder 9 passed over Wet bulb 4. and then rolled on cylinder 8.

13 indicates an extension to an air tight,

tank 14. lThis. latter tank is closed at the top. and is filled with Water, which flows.

It will be seen that the absorbentcovering for wet bu-lb is immersed in the liquid contained in tanka` 13 and 14. which by capillary attraction will be drawn up into this covering of the thermometer bulb 4' consequently maintaining it in a moisteued condition. 'l`o afford a convenient and easy means for chanoiner the working'surface of this covering. we have devised the arrangement shown so that whenever a change in the working,r surface of the covering,r is required. it is only neerzet-'ary `to turn the hand wheel 12 and revolve the cylinder this presents new surface, of con"ever or covering to the wet-'bulb member, and one whose pores are not titled p 'il .e wwf-.f ....w,... ..-um mgm r stro'nv y with the' dus 5f the air and the ein parucles from the water, and so by turning the hand Wheelv 12 and changi the position of the mill machinery by a suitable belt, so thatl whenever this machinery is operated, the pulley 18 will revolve slowly, and continu-- ously keep a new and fresh surface of the conveyer against the wet bulb member. vIt y is also obvious that if this instrument stands in a quiet atmosphere whereit is not subject to draftsof air, the indications' will follow the hy rometric law whereas, on the other hand, i it be placed in a sulliciently draft of air, the rate of evaporation will be somewhat increased, and the Vindizations will then follow the psycbrometric 'We do not make claim to any particular f stfyle of liygrometers, or any'particular kind bulb, or material of which the thermometers are made, or any particular shape of bulb, neithendoes this invention apply toindeating instruments alone. Int 1s especially applicable to combined wet and dry bulb mechanisms where differences in tempcratureare not indicated in degrees, Abut.

v'here such differences actuate valves on wenas other devices whereby mogturqpmuc'ing 36 devices are either setl in operation or stoppe depending upon the humidity of the air surrounding the instrument, as described in patents to Stuart W. Cramer, #811,383,` January 30th, 1906, re-issued December 3rd, 1907, #12327, #813,083, February 20th,

1906, and #856,944, J une 11th, 1907.

Having thus 'fully described our Vnvenv.1. In aV hygrometer, a wet bulb niernbel# a covering for the same, meansl for supplying moisture to the'covering, and means for ,drawing the covering across said-member progresslvely.

` 2. In a hygrometer, a wet bulb member,

and means for maintaining the same at the temperature of evaporation, comprising a Yconveyervforsupplying moisture to thebulb, means for drawing said conveyer across said A bulb, and a receptacle for liquid in which the conveyer is immersed progressively.y

3. In a hygrometer, a Wet bulb member;

a covering for the same, means 'forsupplymg water to said covering, and means for simultaneously unwinding and rewmdmg the covering while in contact with the bulb.

In testimony whereof We ailix our signatures, in presence of two witnesses. v

i STUART XV. CRAMER. WILLIAM B. HODGE. VWitnesses: f n

W. C. ELuo'rr, JN0. C. WA'rsoiL 

